[UPDATE]

- adds IdGenerators and IdResolvers for the use of @JsonIdentityInfo

git-svn-id: https://svn.libreccm.org/ccm/trunk@4633 8810af33-2d31-482b-a856-94f89814c4df

ccm-core/src/com/arsdigita/portation/modules/core/categorization/CategorizationIdGenerator.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.categorization;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class CategorizationIdGenerator extends ObjectIdGenerator<String> {
+    @Override
+    public Class<?> getScope() {
+        return Categorization.class;
+    }
+
+    @Override
+    public boolean canUseFor(ObjectIdGenerator<?> gen) {
+        return gen instanceof CategorizationIdGenerator;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> forScope(Class<?> scope) {
+        return this;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> newForSerialization(Object context) {
+        return this;
+    }
+
+    @Override
+    public IdKey key(Object key) {
+        if (key == null) {
+            return null;
+        }
+        return new IdKey(Categorization.class, Categorization.class, key);
+    }
+
+    @Override
+    public String generateId(Object forPojo) {
+        if (!(forPojo instanceof Categorization)) {
+            throw new IllegalArgumentException(
+                "Only Categorization instances are supported.");
+        }
+
+        final Categorization categorization = (Categorization) forPojo;
+
+        return String.format("{%s}{%s}",
+                categorization.getCategory().getUuid(),
+                categorization.getCategorizedObject().getUuid());
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/categorization/CategoryIdResolver.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.categorization;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class CategoryIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(ObjectIdGenerator.IdKey idKey,
+                         Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(ObjectIdGenerator.IdKey id) {
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(Object context) {
+        return new CategoryIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(ObjectIdResolver resolverType) {
+        return resolverType instanceof CategoryIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/core/CcmObjectIdResolver.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.core;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class CcmObjectIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(ObjectIdGenerator.IdKey idKey,
+                         Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(ObjectIdGenerator.IdKey id) {
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(Object context) {
+        return new CcmObjectIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(ObjectIdResolver resolverType) {
+        return resolverType instanceof CcmObjectIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/security/GroupIdResolver.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class GroupIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id,
+                         final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new GroupIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver objectIdResolver) {
+        return objectIdResolver instanceof GroupIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/security/GroupMembershipIdGenerator.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class GroupMembershipIdGenerator extends ObjectIdGenerator<String> {
+    @Override
+    public Class<?> getScope() {
+        return GroupMembership.class;
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdGenerator<?> gen) {
+        return gen instanceof GroupMembershipIdGenerator;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> forScope(final Class<?> scope) {
+        return this;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> newForSerialization(final Object context) {
+        return this;
+    }
+
+    @Override
+    public IdKey key(final Object key) {
+        if (key == null) {
+            return null;
+        }
+        return new IdKey(GroupMembership.class, GroupMembership.class, key);
+    }
+
+    @Override
+    public String generateId(final Object forPojo) {
+        if (!(forPojo instanceof GroupMembership)) {
+            throw new IllegalArgumentException(
+                    "Only GroupMembership instances are supported.");
+        }
+
+        final GroupMembership membership = (GroupMembership) forPojo;
+
+        return String.format("{%s}{%s}",
+                membership.getGroup().getName(),
+                membership.getMember().getName());
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/security/PartyIdResolver.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class PartyIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id,
+                         final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        // Find the user for the id (don't confuse that with the primary key!).
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new PartyIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof PartyIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/security/PermissionIdGenerator.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class PermissionIdGenerator extends ObjectIdGenerator<String> {
+    @Override
+    public Class<?> getScope() {
+        return Permission.class;
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdGenerator<?> gen) {
+        return gen instanceof PermissionIdGenerator;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> forScope(final Class<?> scope) {
+        return this;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> newForSerialization(final Object context) {
+        return this;
+    }
+
+    @Override
+    public IdKey key(final Object key) {
+        if (key == null) {
+            return null;
+        }
+        return new IdKey(Permission.class, Permission.class, key);
+    }
+
+    @Override
+    public String generateId(final Object forPojo) {
+        if (!(forPojo instanceof Permission)) {
+            throw new IllegalArgumentException(
+                    "Only Permission instances are supported.");
+        }
+
+        final Permission permission = (Permission) forPojo;
+
+        return String.format("{%s}{%s}{%s}",
+                permission.getGrantedPrivilege(),
+                permission.getObject(),
+                permission.getGrantee());
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/security/PermissionIdResolver.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class PermissionIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id,
+                         final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        // Find the user for the id (don't confuse that with the primary key!).
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new PermissionIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof PermissionIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/security/RoleIdResolver.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class RoleIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id,
+                         final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        // Find the user for the id (don't confuse that with the primary key!).
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new RoleIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof RoleIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/security/RoleMembershipIdGenerator.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class RoleMembershipIdGenerator extends ObjectIdGenerator<String> {
+    @Override
+    public Class<?> getScope() {
+        return RoleMembership.class;
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdGenerator<?> gen) {
+        return gen instanceof RoleMembershipIdGenerator;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> forScope(final Class<?> scope) {
+        return this;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> newForSerialization(final Object context) {
+        return this;
+    }
+
+    @Override
+    public IdKey key(final Object key) {
+        if (key == null) {
+            return null;
+        }
+        return new IdKey(RoleMembership.class, RoleMembership.class, key);
+    }
+
+    @Override
+    public String generateId(final Object forPojo) {
+        if (!(forPojo instanceof RoleMembership)) {
+            throw new IllegalArgumentException(
+                    "Only RoleMembership instances are supported.");
+        }
+
+        final RoleMembership membership = (RoleMembership) forPojo;
+
+        return String.format("{%s}{%s}",
+                membership.getRole().getName(),
+                membership.getMember().getName());
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/security/UserIdResolver.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.security;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class UserIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id,
+                         final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        // Find the user for the id (don't confuse that with the primary key!).
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new UserIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof UserIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/workflow/AssignableTaskIdResolver.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.workflow;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class AssignableTaskIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id,
+                         final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        // Find the user for the id (don't confuse that with the primary key!).
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new AssignableTaskIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof AssignableTaskIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/workflow/TaskAssignmentIdGenerator.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.workflow;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class TaskAssignmentIdGenerator extends ObjectIdGenerator<String> {
+    @Override
+    public Class<?> getScope() {
+        return TaskAssignment.class;
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdGenerator<?> gen) {
+        return gen instanceof TaskAssignmentIdGenerator;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> forScope(final Class<?> scope) {
+        return this;
+    }
+
+    @Override
+    public ObjectIdGenerator<String> newForSerialization(final Object context) {
+        return this;
+    }
+
+    @Override
+    public IdKey key(final Object key) {
+        if (key == null) {
+            return null;
+        }
+        return new IdKey(TaskAssignment.class, TaskAssignment.class, key);
+    }
+
+    @Override
+    public String generateId(final Object forPojo) {
+        if (!(forPojo instanceof TaskAssignment)) {
+            throw new IllegalArgumentException(
+                    "Only RoleMembership instances are supported.");
+        }
+
+        final TaskAssignment assignment = (TaskAssignment) forPojo;
+
+        return String.format("{%s}{%s}",
+                assignment.getTask().getUuid(),
+                assignment.getRole().getName());
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/workflow/TaskIdResolver.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.workflow;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class TaskIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id,
+                         final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        // Find the user for the id (don't confuse that with the primary key!).
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new TaskIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof TaskIdResolver;
+    }
+}

ccm-core/src/com/arsdigita/portation/modules/core/workflow/WorkflowIdResolver.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package com.arsdigita.portation.modules.core.workflow;
+
+import com.fasterxml.jackson.annotation.ObjectIdGenerator;
+import com.fasterxml.jackson.annotation.ObjectIdResolver;
+
+/**
+ * @author <a href="mailto:tosmers@uni-bremen.de>Tobias Osmers</a>
+ * @version created on 3/15/17
+ */
+public class WorkflowIdResolver implements ObjectIdResolver {
+    @Override
+    public void bindItem(final ObjectIdGenerator.IdKey id,
+                         final Object pojo) {
+        // According to the Jackson JavaDoc, this method can be used to keep
+        // track of objects directly in a resolver implementation. We don't need
+        // this here therefore this method is empty.
+    }
+
+    @Override
+    public Object resolveId(final ObjectIdGenerator.IdKey id) {
+        // Find the user for the id (don't confuse that with the primary key!).
+        return null;
+    }
+
+    @Override
+    public ObjectIdResolver newForDeserialization(final Object context) {
+        return new WorkflowIdResolver();
+    }
+
+    @Override
+    public boolean canUseFor(final ObjectIdResolver resolverType) {
+        return resolverType instanceof WorkflowIdResolver;
+    }
+}