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JsonSupportTransformation.groovy
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JsonSupportTransformation.groovy
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/*
* Copyright (c) 2012, Thomas Westphal
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package de.aonnet.json
import org.codehaus.groovy.control.CompilePhase
import org.codehaus.groovy.control.SourceUnit
import org.codehaus.groovy.transform.GroovyASTTransformation
import org.codehaus.groovy.ast.*
import org.codehaus.groovy.ast.builder.AstBuilder
import org.codehaus.groovy.transform.ASTTransformation
import org.objectweb.asm.Opcodes
@GroovyASTTransformation(phase = CompilePhase.SEMANTIC_ANALYSIS)
class JsonSupportTransformation implements ASTTransformation {
def annotationType = JsonSupport.class.name
void visit(ASTNode[] astNodes, SourceUnit sourceUnit) {
if (!checkClassNode(astNodes, annotationType)) {
// add an error message or a warning
return
}
addMethods((ClassNode) astNodes[1]);
}
private boolean checkClassNode(astNodes, annotationType) {
if (! astNodes) return false
if (! astNodes[0]) return false
if (! astNodes[1]) return false
if (!(astNodes[0] instanceof AnnotationNode)) return false
if (! astNodes[0].classNode?.name == annotationType) return false
if (!(astNodes[1] instanceof ClassNode)) return false
true
}
private void addMethods(ClassNode classNode) {
def phase = CompilePhase.SEMANTIC_ANALYSIS
List<ASTNode> ast = new AstBuilder().buildFromString(phase, false, """
package ${classNode.packageName}
class ${classNode.nameWithoutPackage} {
String toJsonString() {
return de.aonnet.json.JsonConverter.toJsonString(this)
}
Map toJsonMap() {
return de.aonnet.json.JsonConverter.toJsonMap(this)
}
static def newInstanceFromJsonString(String json) {
return de.aonnet.json.JsonConverter.newInstanceFromJsonString(json)
}
static def newInstanceFromJsonMap(Map map) {
return de.aonnet.json.JsonConverter.newInstanceFromJsonMap(map)
}
}
""")
ast[1].methods.each { classNode.addMethod(it) }
}
}