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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.axiom.om.impl.common;

import org.apache.axiom.core.AttributeMatcher;
import org.apache.axiom.core.ClonePolicy;
import org.apache.axiom.core.CoreAttribute;
import org.apache.axiom.core.CoreModelException;
import org.apache.axiom.core.CoreNode;
import org.apache.axiom.core.DetachPolicy;
import org.apache.axiom.core.NSAwareAttributeMatcher;
import org.apache.axiom.core.NamespaceDeclarationMatcher;
import org.apache.axiom.core.NodeType;
import org.apache.axiom.core.Semantics;
import org.apache.axiom.om.OMCloneOptions;
import org.apache.axiom.om.impl.intf.AxiomAttribute;
import org.apache.axiom.om.impl.intf.AxiomElement;
import org.apache.axiom.om.impl.intf.AxiomSourcedElement;

public final class AxiomSemantics implements Semantics {
    public static final AxiomSemantics INSTANCE = new AxiomSemantics();
    
    private AxiomSemantics() {}
    
    @Override
    public DetachPolicy getDetachPolicy() {
        return DetachPolicy.NEW_DOCUMENT;
    }
    
    @Override
    public boolean isUseStrictNamespaceLookup() {
        return true;
    }

    @Override
    public boolean isParentNode(NodeType nodeType) {
        return nodeType == NodeType.DOCUMENT || nodeType == NodeType.NS_AWARE_ELEMENT;
    }

    public static final AttributeMatcher ATTRIBUTE_MATCHER = new NSAwareAttributeMatcher(
            INSTANCE,
            false,  // Axiom doesn't support namespace unaware attributes
            false);

    public static final AttributeMatcher NAMESPACE_DECLARATION_MATCHER = new NamespaceDeclarationMatcher(INSTANCE);
    
    public static final ClonePolicy CLONE_POLICY = new ClonePolicy() {
        @Override
        public Class getTargetNodeClass(OMCloneOptions options, CoreNode node) {
            if (options != null && options.isPreserveModel()) {
                return node.coreGetNodeClass();
            } else if (options != null && options.isCopyOMDataSources() && node instanceof AxiomSourcedElement) {
                return AxiomSourcedElement.class;
            } else {
                return node.coreGetNodeType().getInterface();
            }
        }

        @Override
        public boolean repairNamespaces(OMCloneOptions options) {
            return true;
        }

        @Override
        public boolean cloneAttributes(OMCloneOptions options) {
            return true;
        }

        @Override
        public boolean cloneChildren(OMCloneOptions options, NodeType nodeType) {
            return true;
        }

        @Override
        public void postProcess(OMCloneOptions options, CoreNode clone) {
            if (clone instanceof AxiomElement && ((AxiomElement)clone).isExpanded()) {
                // Repair namespaces
                AxiomElement element = (AxiomElement)clone;
                NSUtil.handleNamespace(element, element.getNamespace(), false, true);
                CoreAttribute attr = element.coreGetFirstAttribute();
                while (attr != null) {
                    if (attr instanceof AxiomAttribute) {
                        NSUtil.handleNamespace(element, ((AxiomAttribute)attr).getNamespace(), true, true);
                    }
                    attr = attr.coreGetNextAttribute();
                }
            }
        }
    };

    @Override
    public RuntimeException toUncheckedException(CoreModelException ex) {
        return AxiomExceptionTranslator.translate(ex);
    }
}