/*******************************************************************************
 * Copyright (c) 2009, 2012 Oracle. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0, which accompanies this distribution
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 * 
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.jpa.core.internal.jpa2.resource.java.source;

import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jpt.common.core.internal.resource.java.source.SourceAnnotation;
import org.eclipse.jpt.common.core.internal.utility.jdt.AnnotatedElementAnnotationElementAdapter;
import org.eclipse.jpt.common.core.internal.utility.jdt.ConversionDeclarationAnnotationElementAdapter;
import org.eclipse.jpt.common.core.internal.utility.jdt.SimpleDeclarationAnnotationAdapter;
import org.eclipse.jpt.common.core.resource.java.JavaResourceAnnotatedElement;
import org.eclipse.jpt.common.core.utility.TextRange;
import org.eclipse.jpt.common.core.utility.jdt.AnnotatedElement;
import org.eclipse.jpt.common.core.utility.jdt.AnnotationElementAdapter;
import org.eclipse.jpt.common.core.utility.jdt.DeclarationAnnotationAdapter;
import org.eclipse.jpt.common.core.utility.jdt.DeclarationAnnotationElementAdapter;
import org.eclipse.jpt.jpa.core.jpa2.resource.java.JPA2_0;
import org.eclipse.jpt.jpa.core.jpa2.resource.java.MapsId2_0Annotation;

/**
 * <code>javax.persistence.MapsId</code>
 */
public final class SourceMapsId2_0Annotation
	extends SourceAnnotation
	implements MapsId2_0Annotation
{
	private static final DeclarationAnnotationAdapter DECLARATION_ANNOTATION_ADAPTER = new SimpleDeclarationAnnotationAdapter(ANNOTATION_NAME);
	
	private static final DeclarationAnnotationElementAdapter<String> VALUE_ADAPTER = buildValueAdapter();
	private final AnnotationElementAdapter<String> valueAdapter;
	private String value;
	private TextRange valueTextRange;
	
	
	public SourceMapsId2_0Annotation(JavaResourceAnnotatedElement parent, AnnotatedElement element) {
		super(parent, element, DECLARATION_ANNOTATION_ADAPTER);
		this.valueAdapter = new AnnotatedElementAnnotationElementAdapter<String>(element, VALUE_ADAPTER);
	}
	
	
	public String getAnnotationName() {
		return ANNOTATION_NAME;
	}
	
	public void initialize(CompilationUnit astRoot) {
		this.value = this.buildValue(astRoot);
		this.valueTextRange = this.buildValueTextRange(astRoot);
	}
	
	public void synchronizeWith(CompilationUnit astRoot) {
		this.syncValue(this.buildValue(astRoot));
		this.valueTextRange = this.buildValueTextRange(astRoot);
	}
	
	@Override
	public boolean isUnset() {
		return super.isUnset() &&
				(this.value == null);
	}

	@Override
	public void toString(StringBuilder sb) {
		sb.append(this.value);
	}
	
	
	// ********** MapsId2_0Annotation implementation **********
	
	public String getValue() {
		return this.value;
	}
	
	public void setValue(String value) {
		if (this.attributeValueHasChanged(this.value, value)) {
			this.value = value;
			this.valueAdapter.setValue(value);
		}
	}

	private void syncValue(String astValue) {
		String old = this.value;
		this.value = astValue;
		this.firePropertyChanged(VALUE_PROPERTY, old, astValue);
	}

	private String buildValue(CompilationUnit astRoot) {
		return this.valueAdapter.getValue(astRoot);
	}
	
	public TextRange getValueTextRange() {
		return this.valueTextRange;
	}
	
	private TextRange buildValueTextRange(CompilationUnit astRoot) {
		return this.getElementTextRange(VALUE_ADAPTER, astRoot);
	}
	
	public boolean valueTouches(int pos) {
		return this.textRangeTouches(this.valueTextRange, pos);
	}
	
	
	// ********** static methods **********
	
	private static DeclarationAnnotationElementAdapter<String> buildValueAdapter() {
		return ConversionDeclarationAnnotationElementAdapter.forStrings(
				DECLARATION_ANNOTATION_ADAPTER, JPA2_0.MAPS_ID__VALUE);
	}
}